src: remove forwards for v8::GC*logueCallback
These types are no longer used in the file and V8 4.9 no longer defines these types anymore.
R=@bnoordhuis
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
These types are no longer used in the file and V8 4.9 no longer defines these types anymore.
R=@bnoordhuis